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/******************************************************************************

* FILE: omp_orphan.c

* DESCRIPTION:

*   OpenMP Example - Parallel region with an orphaned directive - C/C++ Version

*   This example demonstrates a dot product  being performed by an orphaned

*   loop reduction construct.  Scoping of the reduction variable is critical.

* AUTHOR: Blaise Barney  5/99

* LAST REVISED: 04/06/05

******************************************************************************/

#include <omp.h>

#include <stdio.h>

#include <stdlib.h>

#define VECLEN 100

float a[VECLEN], b[VECLEN], sum;

float dotprod ()

{

int i,tid;

tid = omp_get_thread_num();

#pragma omp for reduction(+:sum)

  for (i=0; i < VECLEN; i++)

    {

    sum = sum + (a[i]*b[i]);

    printf("  tid= %d i=%d\n",tid,i);

    }

return(sum);

}

int main (int argc, char *argv[])

{

int i;

for (i=0; i < VECLEN; i++)

  a[i] = b[i] = 1.0 * i;

sum = 0.0;

#pragma omp parallel

  sum = dotprod();

printf("Sum = %f\n",sum);

  return 0;

}